NEET Biology Animal Kingdom MCQs Set 31

Biology Objective Questions and Answers: Animal Kingdom

Access targeted multiple-choice questions for Animal Kingdom designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Download Animal Kingdom MCQs with Answers

View or download the dedicated Animal Kingdom MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.

Multiple Choice Questions

Question 1: Which of the following statements is incorrect?
(a) In chordates, the heart is ventrally located
(b) In non-chordates, the nerve cord is ventrally located
(c) In all echinoderms, the anus is ventrally located
(d) In molluscs, the muscular foot is ventrally located
Show Answer & Explanation

Answer: (c) In all echinoderms, the anus is ventrally located

Explanation:
1. In echinoderms the anus is on the aboral (dorsal) side or at the posterior end, so it is not ventral in all.

Teacher's Note:
1. The other three statements are true of chordates, non-chordates and molluscs.
2. In chordates the nerve cord is dorsal and the heart is ventral.

Question 2: Metamerism means:
(a) The body is externally and internally divided into segments
(b) Each segment has serial repetition of at least some organs
(c) Both 1 and 2
(d) There is no repetition of any organ in successive segments
Show Answer & Explanation

Answer: (c) Both 1 and 2

Explanation:
1. In metamerism the body is divided externally and internally into segments, and some organs are repeated serially in each.

Teacher's Note:
1. So both statements 1 and 2 describe it.
2. Annelids, arthropods and chordates are metameric.

Question 3: Which phylum includes bilaterally symmetrical, eucoelomate, protostomate animals having a closed circulatory system?
(a) Aschelminthes
(b) Annelida
(c) Platyhelminthes
(d) Arthropoda
Show Answer & Explanation

Answer: (b) Annelida

Explanation:
1. Annelids have a true coelom, are protostomes and have a closed circulatory system.

Teacher's Note:
1. Aschelminthes have a pseudocoelom, Platyhelminthes have no coelom, and arthropods have an open circulatory system.
2. Hence the answer is Annelida.

Question 4: Choose the unisexual endoparasite:
(a) Taenia
(b) Fasciola
(c) Schistosoma
(d) Mosquito
Show Answer & Explanation

Answer: (c) Schistosoma

Explanation:
1. Schistosoma (blood fluke) is an endoparasite whose sexes are separate.

Teacher's Note:
1. Taenia and Fasciola are hermaphrodite flatworms, and a mosquito is an ectoparasite.
2. Sexes are separate in the male and female blood flukes.

Question 5: A crab shows bilateral symmetry. In which option are all the animals bilaterally symmetrical?
(a) Fasciola, Hydra, Aurelia
(b) Cockroach, Octopus, starfish
(c) Dog fish, Octopus, Ascaris
(d) Cockroach, Pleurobrachia, frog
Show Answer & Explanation

Answer: (c) Dog fish, Octopus, Ascaris

Explanation:
1. Dog fish, Octopus and Ascaris all have bilateral symmetry.

Teacher's Note:
1. Hydra and Aurelia, the adult starfish and Pleurobrachia are radially symmetrical.
2. Bilateral symmetry is divisible into two equal halves in one plane only.

Question 6: Tissue level of body organisation is found in:
(a) Porifera
(b) Platyhelminthes
(c) Ctenophora
(d) Protozoa
Show Answer & Explanation

Answer: (c) Ctenophora

Explanation:
1. Cnidarians and ctenophores have cells arranged in tissues but no organs.

Teacher's Note:
1. Sponges show cellular level, and flatworms show organ level.
2. Protozoa are unicellular.

Question 7: Match: I Diploblastic, II Metamerism, III Notochord with a True segmentation, b Two embryonic germ layers, c Ventrally present mesodermal rod like structure, d Dorsally present mesodermal rod like structure.
(a) I-b, II-a, III-c
(b) I-b, II-a, III-d
(c) I-b, II-a, III-c and d
(d) I-b, II-c, III-d
Show Answer & Explanation

Answer: (b) I-b, II-a, III-d

Explanation:
1. Diploblastic animals have two germ layers, metamerism means true segmentation, and the notochord is a dorsal mesodermal rod.

Teacher's Note:
1. So the correct match is I-b, II-a, III-d.
2. The notochord lies dorsal to the gut and ventral to the nerve cord.

Question 8: "Digestive system has only a single opening to the outside of the body that serves as both mouth and anus and is hence called __A__ and it is found in __B__." What are A and B?
(a) A - incomplete digestive system, B - Platyhelminthes
(b) A - incomplete digestive system, B - Aschelminthes
(c) A - complete digestive system, B - Annelida
(d) A - complete digestive system, B - Platyhelminthes
Show Answer & Explanation

Answer: (a) A - incomplete digestive system, B - Platyhelminthes

Explanation:
1. A gut with a single opening is an incomplete digestive system.

Teacher's Note:
1. Flatworms such as Fasciola and Taenia have it, whereas aschelminthes and annelids have a complete gut with mouth and anus.
2. In Taenia the gut is absent altogether.

Question 9: Which one of the following statements is incorrect?
(a) When any plane passing through the central axis divides the body into two identical halves, it is called bilateral symmetry
(b) When blood is circulated through vessels of varying diameter, it is called closed type of circulation
(c) Notochord is absent in non-chordate animals
(d) A body cavity lined by mesoderm is called coelom
Show Answer & Explanation

Answer: (a) When any plane passing through the central axis divides the body into two identical halves, it is called bilateral symmetry

Explanation:
1. When any plane through the central axis divides the body into two identical halves it is radial symmetry, and bilateral symmetry has only one such plane.

Teacher's Note:
1. The other three statements are correct.
2. Radial symmetry is seen in cnidarians and echinoderms.

Question 10: Out of the following animals, how many show radial symmetry? Pleurobrachia, Aurelia, scorpion, Ascaris, Asterias, Ophiura, Physalia, Taenia
(a) Four
(b) Five
(c) Two
(d) Six
Show Answer & Explanation

Answer: (b) Five

Explanation:
1. Pleurobrachia, Aurelia, Asterias, Ophiura and Physalia are radially symmetrical.

Teacher's Note:
1. Scorpion, Ascaris and Taenia are bilaterally symmetrical.
2. So five animals are radial.

Question 11: Exclusively marine animals are found in which phyla?
(a) Porifera and Coelenterata
(b) Coelenterata and Ctenophora
(c) Echinodermata and Porifera
(d) Echinodermata and Ctenophora
Show Answer & Explanation

Answer: (d) Echinodermata and Ctenophora

Explanation:
1. All members of Echinodermata and Ctenophora live in the sea.

Teacher's Note:
1. Some sponges (Spongilla) live in fresh water, and Hydra is a freshwater cnidarian.
2. Hence only these two phyla are strictly marine.

Question 12: Deuterostome animals are included in:
(a) Annelida, Arthropoda and Mollusca
(b) Mollusca, Echinodermata and Hemichordata
(c) Echinodermata, Hemichordata and Chordata
(d) Platyhelminthes, Nematoda and Chordata
Show Answer & Explanation

Answer: (c) Echinodermata, Hemichordata and Chordata

Explanation:
1. In deuterostomes the blastopore forms the anus and the mouth develops later.

Teacher's Note:
1. Echinoderms, hemichordates and chordates are deuterostomes.
2. Annelids, arthropods and molluscs are protostomes.

Question 13: Match: A Hydra, B Scypha, C Meandrina, D Paramecium with i Choanocytes, ii Trichocyst, iii Polyp stage, iv Coral, v Statocyst.
(a) A-iii, B-i, C-iv, D-v
(b) A-v, B-i, C-iii, D-v
(c) A-iii, B-i, C-iv, D-ii
(d) A-v, B-iv, C-iii, D-ii
Show Answer & Explanation

Answer: (c) A-iii, B-i, C-iv, D-ii

Explanation:
1. Hydra exists only as a polyp, Scypha (a sponge) has choanocytes, Meandrina is a brain coral and Paramecium has trichocysts for defence.

Teacher's Note:
1. So the match is A-iii, B-i, C-iv, D-ii.
2. Statocysts are balance organs of some cnidarians.

Question 14: Which one of the following features is not exhibited by Pleurobrachia?
(a) It is found in marine water and is pelagic
(b) The body bears eight internal rows of ciliated comb plates
(c) Digestion is both extracellular and intracellular
(d) Reproduction takes place only by sexual means
Show Answer & Explanation

Answer: (b) The body bears eight internal rows of ciliated comb plates

Explanation:
1. The eight rows of ciliated comb plates are external, and not internal.

Teacher's Note:
1. Ctenophores are marine, pelagic and show both types of digestion.
2. They reproduce only sexually and have no asexual reproduction.

Question 15: Select the mismatched pair:
(a) Pathogenic protozoans - Trypanosoma and Leishmania
(b) Monogenetic parasite - Entamoeba and Giardia
(c) Cnidarians - Physalia and Pleurobrachia
(d) Digenetic parasite - Plasmodium and Trypanosoma
Show Answer & Explanation

Answer: (c) Cnidarians - Physalia and Pleurobrachia

Explanation:
1. Pleurobrachia is a ctenophore (comb jelly), not a cnidarian.

Teacher's Note:
1. Physalia (Portuguese man of war) is a cnidarian.
2. Entamoeba and Giardia have a single host.

Question 16: Which is not a function of cnidoblasts in coelenterates?
(a) Anchorage
(b) Locomotion and defence
(c) Capturing of prey
(d) Storage of food
Show Answer & Explanation

Answer: (d) Storage of food

Explanation:
1. Cnidoblasts (stinging cells) are used for anchorage, defence, locomotion and capture of prey.

Teacher's Note:
1. They do not store food.
2. Food is stored in other cells.

Question 17: Select the unique feature of sponges:
(a) Porous body and a vascular system
(b) Porous body and a water canal system
(c) Intracellular digestion
(d) Presence of an endoskeleton
Show Answer & Explanation

Answer: (b) Porous body and a water canal system

Explanation:
1. Sponges have a porous body with a water canal system (ostia, spongocoel, osculum), which is a feature found only in them.

Teacher's Note:
1. They have no vascular system.
2. Intracellular digestion occurs in many other animals.

Question 18: Select the incorrect statement with regard to coelenterates:
(a) The polyp reproduces asexually to form medusa
(b) The medusa reproduces sexually to form polyp
(c) The polyp is sessile and umbrella shaped
(d) The medusa is a free swimming stage
Show Answer & Explanation

Answer: (c) The polyp is sessile and umbrella shaped

Explanation:
1. The polyp is sessile and cylindrical, while the medusa is umbrella shaped and free swimming.

Teacher's Note:
1. Polyps form medusae asexually, and medusae form polyps sexually.
2. Both forms may appear in the life cycle of Obelia.

Question 19: Fill in the blanks: "In sponges, fertilisation is __A__ and development is __B__, having a larval stage which is morphologically __C__ from the adult."
(a) A-Internal, B-Indirect, C-Distinct
(b) A-Internal, B-Indirect, C-Similar
(c) A-External, B-Direct, C-Distinct
(d) A-External, B-Indirect, C-Similar
Show Answer & Explanation

Answer: (a) A-Internal, B-Indirect, C-Distinct

Explanation:
1. In sponges fertilisation is internal, and development is indirect.

Teacher's Note:
1. The larva (amphiblastula or parenchymula) is distinct from the adult.
2. Sponges are hermaphrodite.

Question 20: Which type of cells in sponges perform a function similar to that of the interstitial cells of Hydra?
(a) Thesocytes
(b) Myocytes
(c) Scleroblasts
(d) Archaeocytes
Show Answer & Explanation

Answer: (d) Archaeocytes

Explanation:
1. Interstitial cells of Hydra are undifferentiated cells that can form other cells.

Teacher's Note:
1. Archaeocytes of sponges are amoeboid undifferentiated cells that perform the same role.
2. Scleroblasts form spicules.

Question 21: Select the wrong statement:
(a) Setae and parapodia are absent in leeches
(b) Mostly leeches are found in water bodies and are sanguivorous
(c) Body segments are fixed in leeches
(d) Trochophore larva is formed during the development of leeches
Show Answer & Explanation

Answer: (d) Trochophore larva is formed during the development of leeches

Explanation:
1. Leeches show direct development and have no trochophore larva.

Teacher's Note:
1. They lack setae and parapodia, have 33 fixed segments and feed on blood.
2. A trochophore larva occurs in marine annelids like Nereis.

Question 22: Match the animals with their common name and a feature: a Wuchereria, b Hirudinaria, c Taenia, d Fasciola with i Liver fluke, ii Filarial worm, iii Blood sucking leech, iv Tapeworm and Q Cysticercosis, R Metamerism, S Liver rot, T Elephantiasis.
(a) a-ii,R; b-iii,T; c-i,S; d-iv,Q
(b) a-ii,T; b-iii,R; c-iv,Q; d-i,S
(c) a-ii,R; b-iii,Q; c-iv,T; d-i,S
(d) a-ii,Q; b-iii,R; c-iv,S; d-i,T
Show Answer & Explanation

Answer: (b) a-ii,T; b-iii,R; c-iv,Q; d-i,S

Explanation:
1. Wuchereria is the filarial worm causing elephantiasis, Hirudinaria is the blood sucking leech with metamerism, Taenia is the tapeworm causing cysticercosis, and Fasciola is the liver fluke causing liver rot.

Teacher's Note:
1. So the correct option is a-ii,T; b-iii,R; c-iv,Q; d-i,S.
2. Use the disease and host to recall each match.

Question 23: The excretory organ of Planaria is:
(a) Flame cells
(b) Nephridia
(c) Renette cell
(d) Metanephridia
Show Answer & Explanation

Answer: (a) Flame cells

Explanation:
1. Planaria is a flatworm and excretes by protonephridia (flame cells).

Teacher's Note:
1. Nephridia are found in annelids, and renette cells in nematodes.
2. Flame cells also help in osmoregulation.

Question 24: Read the features: (a) complete alimentary canal with a well developed muscular pharynx, (b) dioecious, (c) well marked cephalisation, (d) pseudocoelomate, (e) external fertilisation. Which are not suitable for nematodes?
(a) c and e
(b) b and c
(c) a and b
(d) d and e
Show Answer & Explanation

Answer: (a) c and e

Explanation:
1. Nematodes have a complete gut with a muscular pharynx, separate sexes and a pseudocoelom.
2. They show no marked cephalisation, and fertilisation is internal.

Teacher's Note:
1. So c and e do not fit.
2. Ascaris is a typical nematode.

Question 25: Select the option in which the larval stages of Fasciola are arranged correctly in sequence:
(a) Miracidium, Sporocyst, Redia, Metacercaria, Cercaria
(b) Miracidium, Redia, Sporocyst, Cercaria, Metacercaria
(c) Metacercaria, Sporocyst, Redia, Miracidium, Cercaria
(d) Miracidium, Sporocyst, Redia, Cercaria, Metacercaria
Show Answer & Explanation

Answer: (d) Miracidium, Sporocyst, Redia, Cercaria, Metacercaria

Explanation:
1. The sequence in the liver fluke is miracidium, sporocyst, redia, cercaria and metacercaria.

Teacher's Note:
1. The miracidium enters a snail, and the metacercaria encysts on aquatic plants.
2. The final host is sheep or man.

Free study material for Biology

Download Chapter MCQs: NEET Biology Animal Kingdom

Download Multiple Choice Questions: Animal Kingdom (NEET Biology)

Explore reliable practice questions for Animal Kingdom tailored for NEET Biology learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

Concept Clarification for Animal Kingdom

Cross-reference your completed choices with comprehensive NCERT solutions for NEET Biology to ensure absolute clarity across all sub-topics in this chapter.

Additional Study Resources for NEET Biology

Follow up your worksheet practice by attempting the interactive online Biology MCQ test for this chapter to evaluate your execution speed. All platform resources are free to access.

FAQs

Where can I access latest NEET Biology Animal Kingdom MCQs Set 31?

You can get most exhaustive NEET Biology Animal Kingdom MCQs Set 31 for free on StudiesToday.com. These MCQs for NEET Biology are updated for the 2026-27 academic session as per NEET examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Biology NEET material?

Yes, our NEET Biology Animal Kingdom MCQs Set 31 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the NEET paper is now competency-based.

How do practicing Biology MCQs help in scoring full marks in NEET exams?

By solving our NEET Biology Animal Kingdom MCQs Set 31, NEET students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Biology.

Do you provide answers and explanations for NEET Biology Animal Kingdom MCQs Set 31?

Yes, Biology MCQs for NEET have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused NEET exams.

Can I practice these Biology NEET MCQs online?

Yes, you can also access online interactive tests for NEET Biology Animal Kingdom MCQs Set 31 on StudiesToday.com as they provide instant answers and score to help you track your progress in Biology.